Remove support of Python 3.7

Python 3.7 reached its end of life in June 2023 and it is not even
supported by some of the GH actions.

.github/workflows/main.yml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.7, 3.8, 3.9, '3.10', '3.11.5', '3.12', 'pypy-3.9']  # FIXME: forcing to use py3.11.5 since py3.11.7 causes an inexplicable failure in multiprocessing.
+        python-version: [3.8, 3.9, '3.10', '3.11.5', '3.12', 'pypy-3.9']  # FIXME: forcing to use py3.11.5 since py3.11.7 causes an inexplicable failure in multiprocessing.
     runs-on: ${{ matrix.os }}
     steps:
       - run: git config --global core.autocrlf input

README.rst

@@ -31,7 +31,7 @@ The `trophy page`_ of the found issues is available from the wiki.
 Requirements
 ============
 
-* Python_ >= 3.7
+* Python_ >= 3.8
 * Java_ SE >= 11 JRE or JDK (the latter is optional)
 
 .. _Python: https://www.python.org

setup.cfg

@@ -14,7 +14,6 @@ classifiers =
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
@@ -27,12 +26,11 @@ platform = any
 [options]
 packages = find:
 include_package_data = True
-python_requires = >=3.7
+python_requires = >=3.8
 install_requires =
     antlerinator>=1!3.0.0
     antlr4-python3-runtime==4.13.1
     autopep8
-    importlib-metadata; python_version < "3.8"
     inators
     jinja2
     regex